This manual is intended to prescribe the duties to be performed by the personnel manning antiaircraft machine guns, and to explain the mechanical action of the gun and the workings of related materiel so that antiaircraft machine-gun equipment.

On October 31, 1919, there were in the Coast Artillery Corps 1,250 officers holding permanent commissions and 270 officers holding temporary commissions. All temporary officers, in good standing, desiring separation from the service have been...